WO2020127715A1

WO2020127715A1 - Pump system

Info

Publication number: WO2020127715A1
Application number: PCT/EP2019/086285
Authority: WO
Inventors: Sebastian Mangold; Manuel FIESEL; Leon LUCK; Björn FREISINGER; Tanja MESSMER
Original assignee: J. Wagner Gmbh
Priority date: 2018-12-21
Filing date: 2019-12-19
Publication date: 2020-06-25
Also published as: JP2022515785A; US20220023898A1; EP3899278A1; CN113439162B; KR20210106543A; EP3899278B1; DE102019135149A1; CN113439162A

Abstract

The invention relates to a pump system for an atomizer nozzle system having at least two atomizer nozzles, in particular for an electrohydrodynamic atomizer, and to a method for operating an electrohydrodynamic atomizer, wherein the pump system comprises at least one hose assembly, and at least one pump rotor (7) and at least one rolling body (6) for forming a rolling region of a peristaltic pump, wherein the hose assembly comprises at least the same number of hose channels as the number of atomizer nozzles and each hose channel is associated with an atomizer nozzle and connects it to the rolling region.

Description

"Pump system"

Electrohydrodynamic atomization of fluids is becoming increasingly important in the field of coating processes.

For example, a device is known from PCT / EP2018 / 060117 which, using electrohydrodynamic atomization, e.g. Applying care products such as sunscreen to a person's body.

The prior art are also common

Peristaltic pumps, so-called roller pumps or peristaltic pumps, are known. According to the principle of a positive displacement pump, a fluid is pressed forward by mechanical deformation of a hose section and is thus pumped. Pumps of this type are also used in the above-mentioned devices in order to convey a fluid to be atomized to the atomizer nozzles, at which the fluid is then subjected to a high voltage in order to bring about the electro-hydrodynamic atomization.

In the electrohydrodynamic atomization of fluids, especially care products such as Sunscreen has given rise to the problem that individual jets

can clog and as a result an additional

Volume flow through the pump is applied to the remaining open nozzles.

The object of the invention is therefore, starting from one

Fluid tank for several nozzles to clog the nozzles avoid in order to enable electrohydrodynamic atomization in the required quality.

This object is achieved by a pump system according to claim 1. Advantageous further training and practical

Refinements are specified in the dependent claims.

The invention relates to a pump system for a

Atomizer nozzle system with at least two atomizer nozzles, in particular for an electrohydrodynamic atomizer, the pump system comprising at least one hose package and at least one pump rotor and at least one roller body for forming a roller region of a peristaltic pump. The

The pump system is characterized in that the hose package comprises at least the same number of hose channels as the number of atomizing nozzles, preferably at least two, in particular three hose channels, and that each hose channel has one

Connection is assigned to an atomizer nozzle and connects it to the rolling area.

The supply of each individual atomizer nozzle with its own hose channel forces a volume flow through each individual atomizer nozzle, so that in the event of an onset of blockage, the subsequently conveyed volume of the fluid unites

forcibly clogs the plug, thereby ensuring fluid flow through the nozzle.

The use of a hose package with several hose channels offers the advantage that a common guidance of the

Hose packages can be easily provided in the device without the need to run individual hoses. A preferred embodiment provides that everyone

Hose channel connects a fluid tank through the rolling area with an atomizer nozzle directly.

By designing individual hose channels from the fluid tank to the atomizer nozzles, each nozzle is supplied with fluid from the fluid tank directly, without the need for a hydraulic one

Communication / interaction, e.g. a pressure equalization or a resulting volume flow between the channels, the

individual transport routes can take place. This is a

predetermined volume flow is forced at each individual atomizer nozzle, which leads to reliable electrohydrodynamic atomization.

Alternatively, an embodiment provides that a

Hose channel from a fluid tank to the rolling area

runs, a division into at least two, preferably three or more hose channels is formed in front of the rolling area and these hose channels through the rolling area up to a respective atomizer nozzle assigned to the respective hose channel

are arranged progressively.

The use of a single hose channel from the fluid tank to the rolling area on the one hand facilitates the connection to a valve system of the fluid tank and on the other hand saves installation space and costs because less hose material between the fluid tank and

Rolling area must be provided. In the rolling area, in which the delivery pressure for the application of the individual

Atomizer nozzles are generated must then be separate

Hose channels are provided so that a division, for example by Y elements or the like, takes place beforehand. An advantageous further development also provides that at least one atomizer nozzle with at least two

Hose channels is connected.

By using several hose channels per atomizer nozzle, each hose channel promoting a defined fluid volume, increased process reliability and error avoidance in electrohydrodynamic atomization can be achieved, since smaller cross-sections can be used and redundancies are achieved. By using smaller hose diameters, e.g. tighter bending radii can be realized in the housing, which gives the design freedom of the

Device architecture increased.

In a further expedient embodiment, at least two, preferably three, in particular four rolling elements are in the

Pump system designed, wherein each rolling element is individually assigned to at least one hose channel.

By using individual rolling elements or individual ones

Rolling element groups, the rolling element groups having several

Rolling elements include, for each hose channel an offset of the rolling movements between the hose channels can be generated by the individual groups of rolling elements e.g.

Are arranged angularly offset on the pump rotor to generate a uniform fluid flow and in particular to reduce pulsation effects. It is also possible that

Adapt rolling elements to the hose channel geometry and / or the arrangement in the housing of the atomizer with regard to the

To optimize installation space and ergonomics.

A further expedient embodiment provides that at least two, preferably three pump rotors are formed are, wherein each pump rotor moves at least one rolling element or at least one rolling element group and is assigned to at least one hose channel.

The use of individual pump rotors, which have a common motor or separate motors or

Motor groups are driven, allows an improved

Regulation of the performance of the pump system. Furthermore, it is also possible to adapt the pump rotors to the hose channel geometry or the hose channel course and / or to optimize the arrangement in the housing of the atomizer with regard to the installation space and ergonomics.

The invention further provides a method for operating an electrohydrodynamic atomizer, the atomizer

at least one, in particular two, preferably three or more

Includes atomizer nozzles, and includes a pump system according to the invention described above and each via the pump system

A defined volume flow of a fluid is forced onto the atomizing nozzle.

Electrohydrodynamic atomization is based on the

Instability of electrically chargeable fluids, particularly fluids that are sufficiently electrically conductive under high voltage, in a strong inhomogeneous electrical field. A high voltage is applied to the fluid. The fluid deforms into a cone, from the tip of which a thin jet, a so-called jet, is emitted, which immediately breaks down into a spray of finely dispersed drops. Under certain conditions, in the Taylor-Kegel mode, the drops have a narrow size distribution. Through the

Interaction with a forced hydraulic Providing a fluid flow can also improve an atomizing effect.

An expedient development of the method is characterized in that a hydraulically generated free jet in the form of a fluid column is created at the outlet of an atomizer nozzle, which atomization occurs only after a free jet area through electrohydrodynamic interaction

trains.

The free jet generated can

Electrohydrodynamic interactions develop more degrees of freedom, so that there is a finer atomization outside the previously geometrically defined nozzle channel.

In a preferred embodiment, with a diameter of an opening of the atomizing nozzle of 0.1 mm to 0.3 mm,

preferably 0.2 mm and / or a length of a fluid channel in the atomizer nozzle of 3 mm to 15 mm, preferably in the region of an insulator, a free jet of 10 mm to 15 mm.

The fluid is brought far in front of the nozzle opening, and the atomization process can develop freely in relation to the surroundings, the direction of the atomization being determined by the

general kinematics, especially by hydraulic

Output of the fluid flow is predetermined.

A hose package in the sense of the invention is understood to mean any accumulation of hoses that can be used in a peristaltic pump (roller pump). It is irrelevant whether the hose package is designed as a jointly extruded multi-channel hose or as a combination of individual hoses. In addition to the actual pump unit, a purap system in the sense of the invention also includes the necessary hoses, since in the case of a peristaltic pump (roller pump) the pump volume is given by the tube section which is processed by the roller bodies by one contained therein

To move fluid volume in front of the rolling element.

The invention will be explained in more detail using the following exemplary embodiment. However, the object of the invention is not limited to the illustrated embodiment.

Show it

Fig.l is an exploded view of a

Peristaltic pump;

2 shows a plan view of a peristaltic pump with a visible rolling area;

3 shows a cross section through a hose package;

4a shows a schematic illustration of a free jet from a nozzle opening;

B shows a schematic illustration of a free jet from a cylindrical atomizing nozzle;

4c shows a schematic representation of a free jet from a conical atomizing nozzle.

1 shows the structure of a known one

Peristaltic pump. It consists of a pump housing a motor 3 is arranged from an upper housing section 1 and a lower housing section 2. The motor 3 has on its output shaft a gear arrangement 4 which drives a rolling element group 5 shown here. The

Rolling element group 5 in the present case comprises four rolling elements 6 which are rotatably arranged on a pump rotor 7.

Such peristaltic pumps / peristaltic pumps are known from the prior art for use with individual tubes.

A corresponding peristaltic pump 10 is shown in FIG

Top view shown, the upper housing section 1 and the gear arrangement 4 have been hidden.

The roller bodies 6 arranged on the pump rotor 7 deform a hose channel 22 (shown schematically as a line) in a roller region 21 in order to pump a fluid by pumping. Of the

Hose channel 22 runs through a pump inlet 23 into the housing 1, 2 through the rolling region 21 (dashed lines

) to a pump outlet 24. From the pump outlet 24, the hose channel 22 continues in the direction of an atomizing nozzle (not shown) assigned to it. At the

The pump inlet 23 leads the hose channel 22 in the direction of the fluid tank (not shown), either a single hose channel 22 reaching to the fluid or a plurality of hose channels being brought together to form a single fluid tank hose (not shown).

Hose guides 25 and 26 are preferably provided for guiding a plurality of hose channels in the rolling region 21, wherein

in the present case the hose guides 25 and 26 in the lower one

Housing section 2 are arranged, and a hose guide (not shown) for the hose channel 22 in the upper

Housing section 1 can be arranged. At the pump outlet 24, the multiple hose channels can then be executed together, or there are corresponding multiple hose guides (not shown) for the individual ones

Hose channels formed.

Figure 3 shows a hose package 30, as in a

Pump system according to the invention could be used. The hose package 30 comprises a first hose channel 31, a second hose channel 32 and a third hose channel 33, which in the present case are connected to one another via connecting webs 34. Such a hose package 30 are produced, for example, in the extrusion process and may well also have further hose channels or in a different geometry of hose channels, e.g. be arranged in a triangular or square shape.

Exemplary dimensions can be specified as follows, the dimensions depending on the application and / or installation space and the fluid to be transported can be varied.

As an example, the hose channels 31, 32 and 33 have a diameter in cross section of 0.7 mm and a wall thickness of 0.6 mm. the webs 34 in turn have a width as a distance between the tubes of 0.2 mm and a thickness of

also 0.2mm.

Figures 4a to 4c show different variants of the

Formation of a hydraulically generated free jet in front of an atomizer nozzle.

FIG. 4a shows a schematic illustration, in which the atomizer nozzle through a nozzle opening 40 in a nozzle body 41 is formed. Due to the hydraulic pump pressure of the pump system according to the invention, a fluid 42 is symmetrical about a central axis 43 through the nozzle opening 40

Exit nozzle opening 40 as a columnar free jet 44. The free jet 44 emerges over a free jet length 45 essentially as a fluid column, the only starting from a distance 46

Atomizing effect 47 uses the electrohydrodynamic atomizer.

In FIG. 4b there is a cylindrical nozzle attachment on the nozzle body 51

52 is provided to form an atomizing nozzle 50. At the end of the cylindrical nozzle attachment 52 is one around a central axis

53 symmetrically formed nozzle opening 54 is provided. The hydraulically conveyed fluid 55 flows through the nozzle body 51, the cylindrical nozzle attachment 52 and forms via a

Open jet length 56 from an open jet 57. After the distance 58, the atomization 59 also begins in this embodiment.

The atomizer nozzle therefore comprises a hydraulic section 60, which extends from the length 61 of the cylindrical

Nozzle attachment 52 and the length of the free jet 56 is composed. To generate the electrohydrodynamic atomization is on

The input of the cylindrical nozzle attachment 52 provides the coupling of a high voltage 62. In principle, however, it is conceivable to introduce the high voltage elsewhere in order to achieve the electrohydrodynamic atomization.

Preferred dimensions of an embodiment are as

Diameter of the nozzle opening 0.2 mm, as a fluid channel in the interior of the nozzle 5.7 mm to about 14 mm, whereby a free jet with a free jet length of 10 mm to 15 mm is generated. In a further embodiment according to FIG. 4c, a conical nozzle attachment 72 is provided on the nozzle body 71 to form an atomizer nozzle 70. At the end of the conical

Nozzle attachment 72 is provided with a nozzle opening 74 which is symmetrical about a central axis 73. The hydraulically conveyed fluid 75 flows through the nozzle body 71

cylindrical nozzle attachment 72 and forms a

Open beam length 76 from a free beam 77. After the distance 78, the atomization 79 also begins in this embodiment.

4c also comprises a conical hydraulic section 80, which is composed of the length 81 of the conical nozzle attachment 72 and the length of the free jet 76. To generate the electrohydrodynamic

Atomization, the coupling of a high voltage 82 is provided at the input of the conical nozzle attachment 72. In principle, however, the high voltage is also conceivable elsewhere

to initiate electrohydrodynamic atomization.

The present invention is not based on the illustrated

Embodiments limited. The use according to the method for operating a is also claimed according to the invention

electrohydrodynamic atomizer, in which the atomizing effect is improved by the hydraulic generation of a free jet, in particular the atomizing effect only occurs after a free jet length 45, 56, 76 after emerging from a nozzle opening. Reference symbol list:

1 housing section

2 housing section

3 engine

4 gear arrangement

4a variant 1 of the formation of a hydraulically generated free jet in front of an atomizer nozzle.

4b Variant 2 of the formation of a hydraulically generated free jet in front of an atomizer nozzle.

4c variant 3 of the formation of a hydraulically generated free jet in front of an atomizer nozzle.

5 rolling element group

6 rolling elements

7 pump rotor

10 peristaltic pump

21 rolling area

22 hose channel

23 pump inlet

24 pump outlet

25 hose guide

26 hose guide

30 hose package

31 hose duct

32 hose channel

33 hose channel

34 connecting bars

40 nozzle opening

41 nozzle body

42 fluid

43 central axis

44 free jet 45 free jet length

46 distance

47 atomizing effect

51 nozzle body

52 nozzle attachment

53 central axis

54 nozzle opening

55 fluid

56 free jet length

57 free jet

58 distance

59 atomization

60 section

61 nozzle length

62 high voltage

70 atomizer nozzle

71 nozzle body

72 nozzle attachment

73 central axis

74 nozzle opening

75 fluid

76 free jet length

77 free jet

78 distance

79 atomization

80 hydraulic section

81 nozzle length

82 high voltage

Claims

Expectations :

1. Pump system for an atomizer nozzle system with at least two atomizer nozzles, in particular for one

electrohydrodynamic atomizer, the pump system

at least one hose package (30) and at least one

Pump rotor (7) and at least one rolling element (6) for

Formation of a rolling area (21) of a peristaltic pump

includes,

characterized in that

the hose package (30) at least the same number

Includes hose channels (22) such as the number of atomizing nozzles (70) and that each hose channel (22) one

Atomizer nozzle (70) is assigned and this with the

Rolling area (21) connects.

2. Pump system according to claim 1, characterized in that each hose channel (22) has a fluid tank through the

Rolling area (21) with an atomizing nozzle (70)

connects directly.

3. Pump system according to claim 1, characterized in that a hose channel (22) from a fluid tank to the front

Rolling area (21) runs in front of the rolling area (21)

Division into at least two, preferably three or more

Hose ducts (22) is formed and these hose ducts (22) are arranged running through the rolling region (21) up to one atomizer nozzle (70) assigned to the respective hose duct (22).

4. Pump system according to one of the preceding claims, characterized in that at least one atomizer nozzle (70) is connected to at least two hose channels (22).

5. Pump system according to one of the preceding claims, characterized in that at least two, preferably four rolling elements (6) are formed, each rolling element (6) being assigned to at least one hose channel (22).

6. Pump system according to one of the preceding claims, characterized in that at least two, preferably three pump rotors (7) are formed, each pump rotor (7) moving at least one rolling element (6) and being assigned to at least one hose channel (22).

7. Method of operating an electrohydrodynamic

Atomizer, the atomizer comprising at least one, preferably three or more atomizer nozzles (70),

characterized in that

a pump system according to one of the preceding claims is included and, via the pump system of each atomizing nozzle (70), a defined volume flow of a fluid (42, 75, 55)

is imposed.

8. The method according to claim 7, characterized in that at the outlet of an atomizer nozzle (70) a hydraulically generated free jet (44, 57, 77) in the form of a fluid column, which only after a free jet area

electrohydrodynamic interaction forms an atomization (79).

9. The method according to claim 8, characterized in that a diameter of an opening of the atomizer nozzle (70) from 0.1mm to 0.3mm and / or a length of a fluid channel in the atomizer nozzle (70) from 3mm to 15mm Free jet (44, 57,

77) from 10 mm to 15 mm.